Granted Patent
Utility
US 4,708,772 · App. 06/863,658
Paper products containing wet strength resins
Inventor:
William W. Maslanka
Patented Case
View Patent ↗
Granted: Nov 24, 1987
Filed: May 15, 1986
Inventor
William W. Maslanka
Assignee (at issue)
HERCULES LLC
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.